integration/http/src/main/java/io/seata/integration/http/TransactionPropagationIntercepter.java
<gh_stars>0/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package io.seata.integration.http;

import io.seata.core.context.RootContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Springmvc Intercepter.
 *
 * @author wangxb
 */
public class TransactionPropagationIntercepter extends HandlerInterceptorAdapter {


    private static final Logger LOGGER = LoggerFactory.getLogger(TransactionPropagationIntercepter.class);


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        String xid = RootContext.getXID();
        String rpcXid = request.getHeader(RootContext.KEY_XID);

        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("xid in RootContext[{}] xid in HttpContext[{}]", xid, rpcXid);
        }
        if (rpcXid != null) {
            RootContext.bind(rpcXid);
            if (LOGGER.isDebugEnabled()) {
                LOGGER.debug("bind[{}] to RootContext", rpcXid);
            }
        }


        return true;
    }

    @Override
    public void postHandle(
            HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
        XidResource.cleanXid(request.getHeader(RootContext.KEY_XID));
    }


}
